I had to take ( Bug ) into the vet today for her rabies shot ( not happy about that ) she is only 3lbs and has been laying around all day, very unlike her.. I talked to the vet about comfortis.. He said because she is so small that I should buy the lowest dose and cut them in half, I purchased 3 pills from them today, but I plan on calling the company that makes the product 888-545-5973 to get more info ... I would also like to ask everyone about retaining puppy teeth... Bug has two sets of lower canines and my vet says if they are not bothering her we should just leave them alone and watch her.. until they start to bother her.. I was kinda happy about that because I am afraid of having her put to sleep.. She has no problems eating and the teeth do not seem to bother her... what are you guys thoughts on leaving the teeth ?